The system covers a 65 mile stretch of the Dover Strait/Pas-de-Calais
and is bounded by a line to the east drawn from North Foreland to
the border between France and Belgium; and by a line to the west drawn
from the Royal Sovereign Light Tower, through the Bassurelle Light
Buoy (at its assigned position of 50°32'.80 N, 000°57'.80
E) to the coast of France.
The reference charts are British Admiralty Charts 2449 (1998
edition, scale 1: 150,000) and 2451 (1991 edition, scale 1:150,000),
and also chart 7312 of the French Navy Hydrographic and Oceanographic
Service (INT 1072) (1994 edition, scale 1:375000). Also relevant is
the British Admiralty Chart 5500 - Mariners' Routeing Guide
English Channel and Southern North Sea and the French Navy
Hydrographic and Oceanographic Service, 5HOM 8001 Chart - Guide
pour la préparation de la traversee de la Manche.
The area of the reporting system is covered by modern hydrographic
surveys and areas of unstable seabed are regularly resurveyed to ensure
navigational safety.